-Calling \fBtrace\fR with a nonzero parameter opens the file \fBtrace\fR
-in the current directory for output. The parameter is formed by OR'ing
+The other functions either return a pointer to a string-area
+(allocated by the corresponding function),
+or return no value (such as \fB_tracedump\fP, which implements the
+screen dump for \fBTRACE_UPDATE\fP).
+The caller should not free these
+strings, since the allocation is reused on successive calls.
+To work around the problem of a single string-area per function,
+some use a buffer-number parameter, telling the library to allocate
+additional string-areas.
+.SS Trace Parameter
+The trace parameter is formed by OR'ing